Carrying scraper



Jan. 4, 1949. H. D. KADZ CARRYING SCRAPER 4 Sheets-Sheet 1 Filed June 18, 1945 N E R Q INVENTOR.

Arrow/Ex Jan. 4, h H D KADZ CARRYING SCRAPER Filed June 18, 1945 v 4 Sheets-Sheet 2 IN V EN TOR.

Jan. 4, 1949. H. D. KADZ CARRYING SCRAPER Filed June 18, 1945 4 Sheets-Sheet 3 INVENTOR.

BY I I 14 TTOQ/VE).

CARRYING SCRAPER Filed June 18, 1945 4 Sheets-Sheet 4 IN VEN TOR.

A True/vex Patented Jan. 4, 1949 CARRYING SCEAPER,

Harald D. Kadz, Glendale, cane, assignor' to Kay- Brunner Steel Producia, Inc, a corporation of- Delaware Application June 18', 1945, Serial No. 600,087

4 Claims. 1

My invention relates to carrying scrapers of the type embodied in my pending application, Serial No. 522,235, filed February 14, 1944, and which has since issued as Pat. No. 2,418,554, and which scraper is characterized by an apron and an articulated bowl, the two being operable to effect earth loading, carrying, anddumping by cables actuatable from a winch carried by a tractor for towing the scraper.

It is a purpose of my invention to provide a carrying scraper of the above described character in which the employment of a winch is eliminated together with the attendant expense and disadvantages thereof, and the cables for actuating the bowl and apron are operable by simple and effective mechanisms carried by the scraper and controllable from the tractor.

It is also a purpose of my invention to provide a carrying scraper in which the actuating mechanisms for the cables are in the form of hydraulic rams, and the cables are so correlated to the rams, the bowl and the apron, that their operation of the rams, the bowl and the apron can be eifected in the required sequence to produce loading, carrying and the complete dumping of earth from the bowl irrespective of the character thereof being handled, by virtue of the articulated construction of the bowl. 7

A further purpose of my invention is the provision of a carrying scraper in which the actuating mechanism for establishing loading and carrying positions of the bowl, may comprise a single ram and. a single cable, the bowl being con nected to the apron through a single cable so that when the bowl is elevated the apron is closed to confine the earth within the bowl, and when the bowl is lowered for loading the apron is partly elevated to permit such loading.

Another purpose of my invention is the provision of a carrying scraper having the advantages set forth in the preceding paragraph, and, in addition, a hydraulic ram for actuating the articulated sections of the bowl to elfect dumping thereof, and a cable connection between the apron and the articulated sections whereby, as the sections are. advanced to efiect dumping the apron is elevated to a fully open position to permit of such dumping.

I will describe only one form of carrying scraper embodying my invention and will then point out the novel features thereof in claims.

In the accompanying drawings.

Fig. 1 is a View showing in top plan one form of carrying scraper embodying my invention.

Fig. 2 is a vertical longitudinal sectional view taken on the line 22 of Fig. l and showing the scraper in earth carrying position.

Fig. 3 is an enlarged fragmentary vertical sectional view taken on the line 3 3 of Fig. 2.

' Fig. 4 is a view taken on the line 44 of Fig. 3,

Fig. 5 is a view similar to Fig. 2 showing the scraper in loading or digging position.

Fig. 6 is'a View similar to Fig. 5 showing the scraper in earth dumping position.

Similar reference characters refer to similar parts in each of the several views.

With specific reference to the drawings, my carrying scraper, in its present embodiment, comprises a bowl B pivoted at its rear end on the rear wheel truck T, to occupy earth loading, carrying and dumping positions. A frame F is pivoted to the bowl and supported at its front by a front Wheel truck Tl, there being a swivel connection K between the two by which the scraper as a whole is rendered dirigible'. An apron A is pivoted on the bowl to completely close the front of the latter when carrying earth, to partially open the latter when loading or digging, and to completely open the bowl when dumping the latter and also to and complete dumping of the apron. Three mechanisms M, Ml, and MZ'are included in the scraper, one for elevating the bowl froin loading to carrying posi-- tion, th'e'second for elevating the apron, and the third for actuating the movable parts of the bowl necessary to eifect dumping thereof.

The front truck Tl includes a tongue l5 by which the scraper 'as a whole is adapted to be connected to the tractor for towing thereof. The frame F includes a leg I6 depending from a platform I! to the underside of which is secured a transverse beam I8. At the ends of the beam l8 a pair of rearwardly extending and downwardly inclined side beams 20 are secured. Fitted to and rising from the platform I! are three supporting brackets 2i, 22, and 23, upon which are supported certain of the sheaves of the mechanisms M, MI, and M2, as will be later described herein. I

The bowl B is arranged between the side beams I8, and it includes a pair of side plates 24 having tapered front ends 25 and tapered rear ends 26. The front ends 25 are rigidly connected to each other by a transverse tubular beam 21, while adj acent their rear ends the side plates are rigidly connected by an upper beam 28 and a lower beam 29. Secured to the beams 28 and 29 and extending rearwardly therefrom are a pair of outer plates 30 and a pair of inner plates 3 l, the former being spaced inwardly from the rear ends 26 of th'e'bowl sides, and'cooperating therewith in supporting the rear wheels T therebetween. The inner plates 3! are secured to a cross beam 32 with'the ends of the latter secured to the plates 30, and the plates 3! and the beam 32 providing a mounting for trunnions 33 to support a hydraulical ram as will be more fully described hereinafter. A guard plate 34 may be secured to the beams 23 and 32 for protectingparts of the aforesaid ram against earth falling thereon.

From the preceding description it will be clear that the rear end of the bowl B is pivotally mounted so as to swing vertically about the axles for the wheels of the rear unit T, and to thereby permit the bowl to occupy loading and carrying positions.

Fixed to the inner sides of the bowl plates 24 and spanning the latter is a triangular support 35 to which is secured a cutting or scraping blade 36, which, as shown in Fig. 5, is adapted to out earth from the ground in the loading of the bowl.

To support earth within the bowl and yet efiect complete dumping thereof from the bowl irrespective of the character of the earth being handled, that is whether granular or sticky, the bottom and back of the bowl are of articulated construction. Such construction may be substantially identical to the bowl of my previous application for patent hereinbefore referred to and, hence, may be briefly described herein. The bowl bottom 31 is in the form of a planar plate pivotally mounted at its forward edge by a hinge 38 which extends transversely between the bowl sides. The bowl back 39 is pivotally connected to the rear transverse edge of the bottom 3'! by a hinge 40 which likewise extends transversely between the bowl sides and is unsecured thereto.

To the upper edge of the back 39 is secured a beam 4| which not only reinforces the back but j provides a support for ears 42 carrying rollers 43,

the latter being positioned to engage inclined tracks 44 on the upper edges of the bowl sides 24 and by which the bowl back is caused to rise as it advances from the position shown in Fig. 5 to' that shown in Fig. 6. To the rear side of the bowl back 39 is secured a web 45 which reinforces the back and provides a mounting for the piston rod of the mechanism for actuating the bowl back. qg'This mechanism which has been generally indicated at M2, comp-rises, in the present instance,

a hydraulic ram R, the cylinder 46, of which is be provided and carried by the tractor employed .to tow the scrapenby-whichqthe control oipresi sure'fluid to and from1the; cylinder can .be eiTected at will tooperata-the piston; rodin; effecting-the desired IHOVBITIGIl'bS Ofi-fihfi bOWlI back. When pressure fiuid is supplied. to the cylinder d6; sozas, to move .the piston; ro .4! outwardly-of the :cylinder. and forwardly, of the scraper, the bowl :back' .39 isadvancedbetween the bowl sides from the position shown in;Fi -2-. to; tl'1at shown in Fig. .6; the rollers .4 3:- moyingynpwardly, of y the tracks 44- and into engagementswith storm-"5D;

This causes the back;39 .to berlifted .as 'it,;2id,V &I1CS, and being connected tothe bottom 3,|-; the; latter is swung upwardly on its pivots38 so thattheftwo bowl sections I1OW'1'TOCC11DY positions :i-Il which. all earth isdumpedfrom the;bowle. g; The .apron Axis positioned *between. the; bowl sides M :to openqand'; close'the front of thegbowl. and by means of rearwardly. extendingiarms 5! 'plvoted. onithe bowl sides: 24; as (at :52,,the::apron is mounted to occupyar.cQmpletely;;closed p9sirear en we o e r; lilp v around I a sheave 18: mounted. for; giotation about tion as when transporting earth within the bowl, a partly opened position as when loading the bowl, and a completely opened position as when dumping the bowl. The dumping position of the apron is defined by a pair of abutments or stops 53 on the upper ends of fiat rods 54 secured to the upper edges of the bowl sides 24.

The mechanism MI for operating the apron A is interconnected with the mechanism M2 for operating the bowl sections 31 and 39, so that as such sections are advanced for dumping of the bowl the apron is elevated from closed position to completely open position. This mechanism MI is also interconnected with the mechanism M for elevating the bowl B, and in such manner that when the bowl is in loading position the apron is in partly open position, as illustrated in Fig. 5. Also, when the bowl is elevated to carrying position (Fig. 2) the apron is lowered to closed position to confine the earth within the bowl. Therefore, before describing the apron lifting mechanism, I will describe the bowl lifting mechanism.

The bowl lifting mechanism M, in thepresent instance, comprises a hydraulic ram RI, the cylinder 55 of which is positioned transversely on the forward end of the frame F and pivoted thereon at one end as at 56. The piston rod 51 of the ram, which is movable through suitable openings 51a in the brackets 2|, 22, and 23, is pivotally connected to one end of a cable 58 by a clevis 59, such cable being trained about a sheave 6|! mounted for rotation about a vertical axis in a bracket 5| secured to the platform IT. From the sheave 60 the cable extends around and upwardly from a sheave 62 mounted for rotation about a horizontal axis in a frame 53 secured to the supporting bracket 2|. From the sheave 62 the cable 58 passes upwardly and over a sheave 64 mounted for rotation about a horizontal axis between the supporting brackets 2| and 22. The cable 58 passes downwardly from the sheave 64 and is secured in a connector 65 pivoted as at 66 on ears 61 fixed to the beam 21.

As in the case of the ram R, the cylinder 55 of the ram RI is provided at its ends with suitable lengths of hose 68 to extend to the towing tractor, where they are provided with valves for controlling the supply of pressure fluids to opposite ends of the cylinder for actuating the piston rod to in turn actuate the cable 58. It will be understood that in the lowered position of the bowl B the piston rod is fully extended from the cylinder, and that to elevate the bowl the piston rod is moved inwardly of the cylinder thereby actuating the cable 58 to lift the forward end of the bowl; v

j ,The'mechanism MI for operating the apro 's ms s s'a cable 69 secured at one end to the connector 65, land at its other end to a connector .10 pivot'e'd as at 1| on ears 12 fixed centrally to the forward sidejo f, the apron A. The intermedial portion off'th cable 69 is trained over a sheave 13' mounted for rotation about a horizontal axis between the upper ends of the supears T1 fixedcentrally'to the 'crosslbearfig F 14' eXt n a horizontal axisl in abracket .19" .fixed to a .81 a d iai e. enerat s- 13m 19 18 he peb emjpas ss.JlPW XQ Iemii Qn dawn.- wardl a ndasinat $9na ht-i9?" eieti about the same axis as the sheave 13, and positioned between the supporting brackets 21 and 22.

By virtue of the aforedescribed mechanism for actuating the apron, it will be clear that operation of the apron is controlled by operation of the bowl through the cable 69, as well as by operation of the bowl back 39 through the cable 14. In the latter case it is necessary to provide some means for preventing the cable 14 from slackening to such an extent that it falls into the earth collected in the bowl during the loading operation in which the apron A is in the elevated position shown in Fig. 5. If this were permitted the cable would collect earth, particularly if wet, which would ultimately reach and foul the sheaves over which the cable is trained, or it may cause the cable to be thrown off of the sheaves.

I provide such a means, which in the present instance, comprises a gripping device D (see Figs. 3 and 4) that functions to hold that portion of the cable 74 extending rearwardly from the sheave 80 (see Fig. 2), against slackening, and yet yielding under the rearward pull exerted on the cable when the bowl back is advanced through operation of the ram R, to permit lifting of the apron by the cable 14.

The device D may comprise a frame 8| secured to the brackets 22 and 23, and in which a screw 82 is threaded for adjustment to vary the tension exerted by a coiled spring 83 on a pressure foot 84 grooved to receive the cable 14 at that point where it passes over the sheave 80. Centering projections 85 and 86 for the spring are formed on the screw and foot, respectively, and a lock-nut 3! is adjustable on the screw for looking the latter in adjusted position.

Manifestly, the spring 83 presses the foot 84 against the cable 14, and the latter against the sheave 80 to cause the device to function as described.

In operation, the scraper, is loaded by lowering the bowl B to the position shown in Fig. 5, so that the blade 36 is at the desired digging level, while the apron A is elevated to a partly open position. Such positioning of the bowl is effected by operation of the ram Rl to s'lacken the cable 58, and under such slackening the bowl in its downward movement exerts a pull on the cable 69 to elevate the apron to partly open position. Although the vertical stretch of the cable 14 is slackened as a result of the aforedescribed operation, that portion of the cable extending from the sheave 80 to the bowl back 39 is retained taut by the device D.

Following loading of the bowl, it is elevated to the carrying position shown in Fig. 2, by operation of the ram Rl to exert a pull on the cable 58. This results in slackening the cable 69 to allow the apron A to fall to closed position.

Dumping of the bowl is effected while it is in elevated position through operation of the ram R to advance the back 39 and then the bottom 31 to the positions shown in Fig. 6. Advancement of the back operates the cable 14 to elevate the apron A to fully open position, thus clearing the front of the bowl to allow discharge of earth by the back and bottom, and also dump-ing earth from the apron itself. It will be understood that during this operation of the cable 14 the device D yields to allow the requisite movement of the cable. I

Once the bowl has been dumped the back 39 and the bottom 31 are restored to their original positions by operation of the ram R to retract the back, and during this operation the cable I4 is 6 actuated by the back to lower the apron to closed postion.

Although I have herein shown and described only one form of carrying scraper embodying my invention, it is to be understood that various changes and modifications may be made therein without departing from the spirit of my invention and the spirit and scope of the appended claims.

I claim:

1. In a carrying scraper: a frame; a bowl mounted thereon for movement to loading and carrying positions, said bowl having relatively fixed sides, and hinged bottom and back sections mounted between said sides for advance movement fro-m a retracted position, an apron mounted on said bowl for closing, partly opening and completely opening the front of said bowl; a first means for operating said bowl; a second means for moving said apron to partly open position; a third means for advancing and retracting said sections between said sides; and a fourth means including sheaves and a cable operatively connecting said sections to said apron so that with advancement of said sections said apron is moved to completely open position; and a device acting when said apron is held by said second means in partly open position, to hold against slackening that portion of said cable above said bowl.

2. A carrying scraper as embodied in claim 1, wherein said device comprises a spring-pressed foot for pressing said cable against one of said sheaves.

3. In a, carrying scraper: a front ground support; a rear ground suport; a bowl pivoted at its rear end to said rear ground support, and having a back mounted for movement forwardly between the sides of the bowl; a frame connected to said front ground support, and pivoted to said bowl; an apron pivoted on said bowl for closing the front of the latter; a first cable mounted on said frame and connected to the front end of said bowl; a hydraulic ram mounted on said frame and connected to said cable for actuating the latter to elevate said bowl; a second cable movably mounted on said frame and anchored at one end to said bowl, and at the other end to said apron, for elevating or lowering said apron through lowering or elevating said bowl; a second hydraulic ram mounted on said bowl and operatively connected to said bowl back for moving the latter forwa d y; and a third cable connected at one end to said bowl back, movably mounted on said bowl and said frame, and connected at its other end to said apron so that as saidbowl is advanced by said second ram, said apron will be elevated to open the front of said bowl.

4. A scraper as embodied in claim 3, wherein said first and second cables are pivotally anchored to said bowl at one and the same point medially of its width, and said second and third cables are pivotally anchored to said apron at one and the same point and medially of its width.

I-IARALD D. KADZ.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number 

